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Transverter RX switch
dlwarnberg
Member ✭✭
Here is my setup, I have a flex 6500, a 70 cm and a 2 meter elecraft transverters, M2 sequencers, an M2 LEO pack with a Yaesu G-450A rotator...
Here is the issue, I discovered the 70cm side was def, I could transmit fine, worked several of the XW-2x sat's wihout issue, but I still could not hear anything from my local repeaters on the 70cm side. My HT could pick them up fine. After a day of troubleshooting I discovered the switch box I am using to switch RX between 2 meters and 70cm is the issue. I take a direct cable from the RX side of the radio to the RX on the transverter and several things happen, noise level drops like a rock, I can hear EVERYTHING... so my switch is BAD.
Question, for those of that have the same setup what switch are you using? I have a generic "Data Transfer Switch" I ordered from amazon and am having a hard time finding a good switch.
Suggestions?
Thanks
David
Here is the issue, I discovered the 70cm side was def, I could transmit fine, worked several of the XW-2x sat's wihout issue, but I still could not hear anything from my local repeaters on the 70cm side. My HT could pick them up fine. After a day of troubleshooting I discovered the switch box I am using to switch RX between 2 meters and 70cm is the issue. I take a direct cable from the RX side of the radio to the RX on the transverter and several things happen, noise level drops like a rock, I can hear EVERYTHING... so my switch is BAD.
Question, for those of that have the same setup what switch are you using? I have a generic "Data Transfer Switch" I ordered from amazon and am having a hard time finding a good switch.
Suggestions?
Thanks
David
0
Answers
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Any good coax switch rated for the frequencies in question should work. I use a Daiwa 4-position coax switch for exactly the same receiver configuration. Works perfectly.0
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George, so you are using adapters between I would guess.. was hoping to avoid that but from what I'm seeing it's night and day difference with a direct hookup..
Thanks0 -
Guess this is why you don't buy cheap switches...
0 -
You can make cables with the matching connectors, but at 28 MHz a BNC to UHF adapter is no biggie. Just use good cable to prevent undesirable IF ingress.0
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you could also try building a power divider, being this is all on RX it is not very difficult.
all you need is a small metal box (Like a Altoid tin) 3 BNC chassis jacks (or what ever you need) and resisters, the down fall is it will have 3db of loss which you may already be making up with pre-amps.
See the schematic below
73's
Bret
WX7Y
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Thank you.. I'm all about building stuff... and yes I am using preamps.
Thanks again0 -
Tricky thing to have both transverters on the same IF at the same time. Could get messy.0
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David
your problem lies in that this is not suitable for switching RF around
I am not surprised it goes deaf ... the switch is a DC switch and certainly not designed to switch RF
for a manual switch you need something that is designed to switch RF that will be low loss and also present good isolation
https://www.dxengineering.com/search/part-type/antenna-switches-manual
Something like this
https://www.dxengineering.com/parts/alf-delta-2b-n
this is rated to beyond 432 MHz
be wary of cheap SO239 switches designed for HF - your liable to find the DC switch again in a different box!
You could also find yourself an SMA relay and build that into the box
But use proper screened cables not single core DC wiring!
You can build something too if you like kits
Something like this
http://tapr.org/kits_tass.html
just buy a cheap SMA relay and some BNCs-SMA leads off ebay and reuse the box
but skip the DC switches - the loss through that will be horrific!
Cheers
Simon ZL4PLM
0 -
Thanks Simon0
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